King of the Rocket Men

This has some of the most convincing flying sequences for its time. The later Superman serial had him "fly" as a cartoon: here, King appears really to fly. I have read that the flying sequences used a lightweight dummy on wires. It looks pretty convincing.

Minor spoiler: There was only one "rocket man": the serial title suggests more. (The hero's name is Jeff King) For that matter, the flight controller is marked, "Slow," "Fast," "Up," and "Down." Not bad, but rough if one had to change direction in flight.

Naturally, the serial uses the standard formula of a colorful villain who's out to steal a secret, whom the hero has to contend with.

Worth viewing, but light entertainment.